This is my drawing of the eye of the Artist Leonardo Pereznieto. Here are his youtube channels: https://www.youtube.com/FineArtEBooks (en)
https://www.youtube.com/ArteDivierte (es)
I drew his eye and Leonardo drew mine, watch his drawing here:
https://youtu.be/6isePB_nWDo (en)
https://youtu.be/-AD5eIZvBTY (es)

Music by Cinquequarti: please feel free to visit http://audiojungle.net/user/Cinquequarti